JACK is more than just one iOS app. It is a system that connects the music
and audio world on your iOS device. JACK allows audio channels and MIDI ports
of your audio & music apps to be connected with each other. It does not force a predefined
schema in which way apps shall be connected with each other. You can freely
connect them in any way you want, intuitively like drawing on a paper. Besides
audio & MIDI interconnection, JACK provides other very useful mechanisms to
let your audio apps work together like never before. For example record/playback
synchronization between DAWs and sequencer apps. Arbitrary data sharing among
apps and much more. Even though JACK is quite new on iOS, it already came a
long way. Providing you the most professional and powerful environment for your
audio apps, highly optimized with explicit multi core support, low latency and
maturity which it gained over many years of usage and development on other operating systems already.
JACK is an open standard, which can freely be supported by anybody.

Intuitive user interface that allows you to easily manage all audio and
MIDI connections, environment settings, monitor current overall CPU usage and more ...

Your favorite audio app does not support JACK yet? Ask your app vendor to add support
for it! Any developer can add JACK support to his app in less than an hour.

¹ If you want to use external audio and/or MIDI devices: The adapter and/or the external
audio/MIDI device you connect must be supported by the iPad/iPhone operating system in
order to be able to use it with this app. To our knowledge there is currently no official
list of supported devices by Apple. We recommend you to check whether your external device is
supported by your iOS version, i.e. for MIDI devices: by using our MIDI monitor app
MIDI Wrench, which is free!

Screenshots

iPad:

Example JACK Graph
App "CMP Grand Piano" has one or more audio output channels and at least one
MIDI input port, but no MIDI output and no audio input.
CMP Grand Piano
Two audio connections from app "CMP Grand Piano" to the iPad's/iPhone's audio output speaker.
MIDI Wrench
One MIDI connection from some MIDI input device (attached to the iPad/iPhone) to the app
"MIDI Wrench". And one MIDI connection into the other direction, that is from app
"MIDI Wrench" to some attached MIDI output device.
System
"System" is a special JACK client, which is not an app, but instead provides access
to the iPad's/iPhone's audio input/output channels (microphone and speakers) and MIDI
input/output ports (if some MIDI device is attached to the iPad/iPhone).

Apps

SDK

You are an app developer and want your audio / music app to become connected with
other JACK apps? Download the JACK Software Development Kit for iOS now!

License Terms

JACK iOS is free and open source. Refer to the JACK iOS License Terms
for the exact copyright, usage & license conditions. Everybody is invited
to review the source code
and to improve JACK iOS under the given open source license terms.

Download

JACK is currently available for the following mobile phones and tablet
devices. In case you encounter any problems while using this app, please
report it to us by using the contact form at the end of this page.